21872177490 has 64 divisors (see below), whose sum is σ = 53105725440. Its totient is φ = 5764872960.

The previous prime is 21872177473. The next prime is 21872177501. The reversal of 21872177490 is 9477127812.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1014220 + ... + 1035560.

It is an arithmetic number, because the mean of its divisors is an integer number (829776960).

Almost surely, 2^21872177490 is an apocalyptic number.

21872177490 is an abundant number, since it is smaller than the sum of its proper divisors (31233547950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21872177490 is a wasteful number, since it uses less digits than its factorization.

21872177490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21747.

The product of its (nonzero) digits is 395136, while the sum is 48.

The spelling of 21872177490 in words is "twenty-one billion, eight hundred seventy-two million, one hundred seventy-seven thousand, four hundred ninety".